add changelog for v2.0.0

lotusdblabs · Sep 4, 2023 · dc886e8 · dc886e8
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+# Release 2.0.0 (2023-09-04)
+
+## 🚀 New Features
+* Change the architecture of LotusDB
+  * Use wal project to store Write-Ahead-Log and Value-Log
+  * Hash key into different indexes and value log files
+  * Index and Vlog read/write will be concurrent
+* Basic Put/Get/Delete/Exist operations
+* Batch Put/Delete operations
+* Value log compaction